January 2005 Abbie Mathew, NewLANS Slide 1 IEEE 802.15-05/054r0 Submission Project: IEEE P802.15...
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Transcript of January 2005 Abbie Mathew, NewLANS Slide 1 IEEE 802.15-05/054r0 Submission Project: IEEE P802.15...
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 11
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Project: IEEE P802.15 Working Group for Wireless Personal Area NetworksProject: IEEE P802.15 Working Group for Wireless Personal Area Networks
Submission Title: [WCA’s petition to the FCC for amendment to part 15.255]Date Submitted: [January 17, 2005]Source: [Abbie Mathew] Company [NewLANS, Inc.]Address [238 Littleton Road, Westford, MA 01886-3531, U.S.A.]Voice: [(617) 283-1363], E-Mail: [[email protected]]
Re: []
Abstract: [Update on WCA’s petition to the FCC for amendment to Part 15.255]
Purpose: [Contribution to 802.15 SG3c at January 2005 plenary in Monterey, CA]
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 22
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Existing Rules in Part 15.255Existing Rules in Part 15.255
InterferenceInterference
Average power density ≤ 9 Average power density ≤ 9 W/cmW/cm22 at 3 m at 3 m• Translates to EIRP of 40 dBm in the far fieldTranslates to EIRP of 40 dBm in the far field
Peak power density ≤ 18 Peak power density ≤ 18 W/cmW/cm22 at 3 m at 3 m• Translates to an EIRP of 43 dBm in the far fieldTranslates to an EIRP of 43 dBm in the far field
Total peak transmitter power ≤ 500 mWTotal peak transmitter power ≤ 500 mW
RF RadiationRF Radiation
Power density ≤ 1 mW/cmPower density ≤ 1 mW/cm22 on antenna surface on antenna surface
Transmitter IdentificationTransmitter Identification
Within any 1 second interval of signal transmission, each transmitter Within any 1 second interval of signal transmission, each transmitter
must transmit a transmitter identification at least onemust transmit a transmitter identification at least one
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 33
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Near Field & Far FieldNear Field & Far Field
Aperture Aperture , cm, cm ~ Gain, dBi~ Gain, dBi ~ ~ ӨӨ3dB3dB Near Field, cmNear Field, cm Far Field, cmFar Field, cm
22 19.019.0 18.3º18.3º 2.02.0 4.84.8
77 29.929.9 5.2º5.2º 24.724.7 59.359.3
88 31.131.1 4.6º4.6º 32.332.3 77.477.4
1515 36.536.5 2.4º2.4º 113.4113.4 272.3272.3
1616 37.137.1 2.3º2.3º 129.1129.1 309.8309.8
2424 40.640.6 1.5º1.5º 290.4290.4 697.0697.0
2525 41.041.0 1.5º1.5º 315.1315.1 756.3756.3
6161 48.748.7 0.6º0.6º 1,876.01,876.0 4,502.44,502.4
RNF = D2/4 RFF = 0.6 D2/
Transition Region
Frequency = 60.5 GHz, Aperture Efficiency = 50%
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 44
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
EIRP Based on Part 15.255EIRP Based on Part 15.255
Aperture Aperture ~ Gain~ Gain Average Average EIRPEIRP
Input Input Power Power
SSSS S at 3mS at 3m Location Location of 3mof 3m
cmcm dBidBi dBmdBm dBmdBm mW/cmmW/cm22 W/cmW/cm22
22 19.019.0 18.018.0 -1.0-1.0 1.01.0 0.070.07 FFFF
77 29.929.9 39.839.8 9.89.8 1.01.0 8.378.37 FFFF
88 31.131.1 40.040.0 8.98.9 0.60.6 9.009.00 FFFF
1515 36.536.5 40.040.0 3.53.5 0.10.1 9.009.00 FFFF
1616 37.137.1 40.340.3 3.23.2 00 9.009.00 TRTR
2424 40.640.6 43.943.9 3.23.2 00 9.009.00 TRTR
2525 41.041.0 44.444.4 3.43.4 00 9.009.00 NFNF
6161 48.748.7 59.959.9 11.211.2 00 9.009.00 NFNF
Frequency = 60.5 GHz Aperture Efficiency = 50%
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 55
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
WCA’s Case # 1WCA’s Case # 1
“measurements taken within an antenna near-field can vary significantly based on very small changes in the sampling location. ”
“..the near field for a high gain antenna typically extends beyond the 3-meter point, so there is little correlation between 3-meter PD measurements and the level of RF exposure near the antenna..”
“The sum of the above is that transmitters using high gain antennas in the 57-64 GHz band are forced to operate at PD levels far below those permitted under the Commission’s current RF safety limits. This, in turn, forces vendors to reduce transmit power levels well below the maximum peak power permitted in Section 15.255(e) (27 dBm), thereby reducing link distance substantially.“
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 66
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Alternative Suggested By WCA
• Limit average EIRP to 82 dBm at antenna gain Limit average EIRP to 82 dBm at antenna gain of 51 dBiof 51 dBi
• Limit average EIRP to 82 dBm minus 2 dB/dBi, Limit average EIRP to 82 dBm minus 2 dB/dBi, below 51 dBi gainbelow 51 dBi gain
• Power density will be at or below 1 mW/cmPower density will be at or below 1 mW/cm22 on on the antenna surfacethe antenna surface
EIRP = 82 dBm for Gain > 51 dBi
EIRP = [(2 * Gain) – 20] dBm for Gain ≤ 51 dBi
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 77
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
WCA’s Case # 2WCA’s Case # 2
“…which imposes a transmitter identification (ID) requirement on indoor
antennas used at 57-64 GHz. The purpose of the rule is to permit users
experiencing interference from indoor wireless LAN transmitters to
more accurately identify where the interference is coming from. The
rule thus applies to the transmitter ID requirement to transmission that
emanate from inside a building. Unfortunately, there remains some
confusion over whether the rule’s exclusion of outdoor antennas also
excludes antennas located indoors but directed outside a window,
commonly referred to as ‘window links.’ WCA believes it is reasonable
to assume that the Commission did not intend to apply the rule to
window links, since they effectively pose no greater interference risk
than outdoor links.”
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 88
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Alternative Suggested By WCA
“…WCA therefore asks that the Commission
eliminate any lingering uncertainty about this issue
by modifying Section 15.255(i) to clarify that the
rule’s transmitter ID requirement does not apply to
indoor antennas that direct point-to-point
transmissions outside through a window.”
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 99
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Summary Of The PetitionSummary Of The Petition
-10
0
10
20
30
40
50
60
70
80
0 10 20 30 40 50 60
Antenna Aperture, cm
~ Gain, dBi
Average EIRP, dBm
Average Pin, dBm
Average EIRP, dBm
Average Pin, dBm
Frequency: 60.5 GHz Aperture efficiency: 50%
WCA
15.255
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 1010
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Proposed Rule Change # 1Proposed Rule Change # 1
Replace 15.255(b)(1) with the following text (new matter in red font)
(1) For products other than fixed field disturbance sensors, at least one of the following limits must be met:
(i) The average power density of any emission, measured during the transmit interval, shall not exceed 9W/cm2, as measured 3 m from the radiating structure, and the peak power density of any emission shall not exceed 18W/cm2, as measured 3 m from the radiating structure.
(ii) The average EIRP of any transmitter, measured during the transmit interval, shall be limited to the value of 82 dBm reduced by a factor of 2 dB for every dB that the transmit antenna far field gain is less than 51 dBi.
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 1111
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Proposed Rule Change # 2Proposed Rule Change # 2
Insert language into the first sentence of 15.225(i) as follows.
(i) For all transmissions that emanate from inside a building, except for point-to-point transmissions that are directed outside through a window, within any one second interval of signal transmissions,…
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 1212
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
ConcernsConcerns
• Two guidelinesTwo guidelines• Reflections from window links with WCA’s Reflections from window links with WCA’s
petition petition
January 2005January 2005
Abbie Mathew, NewLANSAbbie Mathew, NewLANSSlide Slide 1313
IEEE 802.15-05/054r0IEEE 802.15-05/054r0
SubmissioSubmissionn
Proposed ActionProposed Action
• Review the petitionReview the petition• Determine if WCA’s petition affects 802.15.3cDetermine if WCA’s petition affects 802.15.3c• If it affects 802.15.3c, write our opinion to the If it affects 802.15.3c, write our opinion to the
FCCFCC
• FCC is expected to make a ruling this quarterFCC is expected to make a ruling this quarter• Discuss this issue at Monterey and not postpone Discuss this issue at Monterey and not postpone
itit